JP6405098B2 - Method for identifying topography deviation of dressing tool of polishing machine and CNC control machine configured accordingly - Google Patents

Description

  The present invention relates to a method for determining the topographic deviation of a dressing tool of a polishing machine and to a polishing machine designed to carry out the method.

  There are many machining methods using polishing tools. In the technical field of gear machining, dressing is performed using a polishing tool, among others. For example, a substantially plate-shaped (flat plate) polishing disk exists, and a pot-shaped and truncated cone-shaped polishing disk exists. The polishing tool is usually coated with an abrasive that is particularly suitable for dressing.

  In a polishing machine, a dressing tool is often provided in addition to the polishing tool, and is used as necessary for dressing the polishing tool. Modern polishing machines typically have a dressing tool that is rotationally driven and is used to perform contouring and dressing of the polishing tool in an automatic CP control scheme (automatic path control scheme).

  For example, when this relates to gear tooth polishing machine processing, the polishing surface (working surface) of the polishing tool again has the desired shape (profile) after a predetermined time so as to ensure sufficient quality of the gear teeth. Need to be processed.

  The dressing process is necessary to realize this purpose, and a profile dressing method or a contour forming / line-by-line dressing method can be used. In the profile dressing process, the dressing tool makes linear contact with the flank surface of the polishing tool, and in the line unit dressing process, it comes into contact with a spot shape. The dimensional accuracy of the polishing tool is reproduced by the dressing process. In addition, the polishing tool is sharpened again during dressing.

  The following description relates to a polishing machine, the dressing of which is based on the principle of a profile dress or foam dress using a dressing roller or dressing disc. With respect to the rotation of the profile dressing roller or profile dressing disc, the surface shape (geometry) of the dressing roller is taken into account when forming the surface shape / contour of the abrasive disc. Also, the surface shape of the polishing disk is taken into account in the description of the surface shape of the workpiece. These dressing tools are particularly suitable for complex profiles during mass production. The rotating form dressing roller or form (form) dressing disk forms or corrects the contour of the polishing tool according to a CNC (Computer Numerical Control) path controlled path along a path preset by the controller. The diamond shaped plate is used as a dressing tool and can be precisely matched to the surface shape of the polishing tool using laser technology.

  Foam dressing and profile dressing depends on a number of variables that can have a substantial impact on the dressing process of the polishing tool. In the case of foam dressing, the surface shape and the degree of overlap (overlapping degree) of the foam dressing roller or foam dressing disk play an important role. In the case of a profile dressing roller or profile dressing disc, the quality of the covering is particularly important for the result of the dressing process.

  As a dressing tool within the scope of the present invention, a CNC-controlled dressing roller or dressing disk is preferably used. As will be described below, the dressing tool is securely fixed so that it can be rotationally driven on a machine bed or a fixed or movable part of the machine. In the special case of adopting the CNC controlled movement of the axis for moving the polishing tool relative to the dressing tool, the path control necessary for the dressing process is executed when the dressing tool rotates only around the dressing axis.

  One requirement for dressing with a dressing tool is that a relative dressing (polishing) movement can occur between the dressing tool and the polishing tool. The dressing tool can rotate in the same direction as the dressing polishing tool or in the opposite direction. In the case of a rotating dressing tool, the speed ratio between the polishing tool and the dressing tool is a variable that affects the dressing result.

  When dressing is performed using a profile dressing roller or profile disk, the relative speed is equal to the difference between the peripheral speeds of the dressing tool and the polishing tool. In order to form the relative speed in the outer circumferential direction, it is necessary to provide a rotation drive unit (rotation drive) independent of the dressing process.

  In the case of profile dressing, the profile accuracy of the polishing tool, actual operation, and shaft runout also play an important role.

  Almost exclusively, foam rollers are used as dressing tools on newer polishing machines, since dressing results with better reproducibility are obtained. These are characterized by a functional width (active width) smaller than the abrasive disc width. The profile that is formed is typically formed using a path controller. These foam rollers are available with a very high degree of freedom.

  In chip removal manufacturing of a bent bevel gear (spiral bevel gear), the single indicator method and the continuous method are distinguished, and the continuous single method is called. The single index method is a discontinuous method.

  FIG. 1 is a schematic side sectional view of a profile polishing disk 10 and a workpiece 1 (here, a spur gear). The profile polishing disk 10 rotates around a rotation axis R1 of the polishing tool (herein simply referred to as a tool rotation axis), and the workpiece 1 rotates around the workpiece axis 2. The workpiece axis 2 is not shown in FIG. 1 and is in a direction perpendicular to the drawing sheet. With respect to the plunge movement E1, the profile abrasive disc 10 is pressed into the interdental gap defined by the two teeth 2,3. After machining the interdental gap, the profile polishing disk 10 is retracted, and the workpiece 1 performs index rotation (intermittent rotation). Then, the profile polishing disk 10 is plunge (pressed) between other teeth, and the tooth blank between each tooth is sequentially machined.

  In particular, polishing is an important method for machining hard gears of Hebel gears. Due to the complicated geometric conditions, hard machining is performed by discontinuous operations "every interdental gap". Most pot-shaped polishing discs used here can be dressed. FIG. 2 is a partially enlarged view of the pot-shaped polishing disk 10 in the inter-gap gap between the two teeth 2 and 3 of the crown gear 1. The pot-shaped polishing disk 10 is shown in cross section.

  FIG. 3 schematically shows how such a pot-shaped polishing disk 10 can be dressed in a polishing machine 100 having a dress disk 30 that can be driven to rotate. At the moment shown, the dress disk 30 is dressing the outer peripheral edge of the polishing disk 10. For this reason, the dress disk 30 is placed outside and above the polishing disk 10. In order to dress the inside of the polishing disk 10, the dressing disk 30 is moved to another position inside the polishing disk by using CNC control, and the rotation direction is reversed. In FIG. 3, a dress disk 30 disposed at a position where the inside of the profile 28 of the polishing disk 10 is dressed is indicated by a broken line. A CNC controller (path controller) 50 of the polishing machine 100 transmits a necessary profile to the polishing disk 10 by guiding the dress disk 30 along the profile 28 of the polishing disk 10 by CNC control. In FIG. 3, signals I1 and I2 indicate corresponding CNC control signals.

  High-precision workpiece machining can only be achieved using the abrasive disc 10 with small tolerances in dimensional and shape accuracy. It is always necessary to ensure that the state of the polishing tool can be handled.

  That is, empirical values have often been used so far to determine when and how often the polishing disk 10 must be dressed. Based on the polishing process and the size of the workpiece 1, the polishing tool 10 is dressed one or more times for each workpiece. As the polishing tool 10 and / or dressing tool 30 wears, the properties of the workpiece 1 being polished can be adversely affected.

  It is known that a machine tool is provided with a coordinate scanning sensor that can measure the workpiece 1 during, for example, machining or when machining is interrupted. However, according to experiments, it is considered that such a coordinate scanning sensor is not suitable for measuring the dress disk 30 or the polishing tool 10. The dress disk 30 is typically coated with polycrystalline diamond or natural diamond, or another high hardness material. In particular, the ruby tactile sensor of the coordinate scanning sensor has to be guided by polishing line by line along the topography of the dress tool 30 so that the actual surface shape of the dress tool 30 can be elucidated. When touching the dressing tool 30 or the like, it may be suddenly destroyed. The polishing tool 10 does not have a coating as hard as the dress tool 30. However, the surface of the polishing tool 10 is relatively rough and not smooth (made of grains), depending on the effective surface roughness. Therefore, the actual surface shape of the polishing tool 10 cannot be determined without taking an enormous amount of time. In addition, because the polishing tool 10 has graininess, such topography measurements are not accurate.

  Therefore, this objective is to provide the possibility to be realized in a polishing machine with a dressing polishing tool, regardless of whether the dressing tool is worn or damaged. Advantageously, an approach for use in automated machining equipment can be developed.

According to the present invention, there is provided a method for determining a topography deviation (topography variation) of a dressing tool mounted so as to be rotationally driven around a dress axis in a CNC control (polishing) machine. This CNC control machine has a polishing tool that is fixed on a tool rotation axis and can be dressed using a dressing tool. That is, this is a dressing polishing tool. The dressing tool initially has a target surface shape and, after dressing one or more polishing tools, has an actual surface shape that deviates from the target surface shape in some circumstances. The invention is characterized in that the following method steps are carried out in a (polishing) machine. That is, this method
a) performing a relative movement of the dressing tool relative to the polishing tool, and when performing this relative movement, at least one contour region of the dressing tool is transferred to a transfer region of the polishing tool;
b) providing a plunge body composed of a material that can be polished in a CNC controlled machine;
c) performing a relative feed movement to move the transfer area of the polishing tool closer to the plunge body;
d) performing a rotational motion of the polishing tool about the polishing tool rotation axis;
e) performing relative plunge movement to press the transfer area of the polishing tool against the constituent material of the plunge body, and transferring the topography of the transfer area to the mapping area of the plunge body when performing the relative plunge movement. Is performed in the form of negative topography,
f) performing a topographic automatic scanning operation of the plunge body using a coordinate scanning sensor;
g) sending a scanning signal from the coordinate scanning sensor to the computer;
h) using a computer to identify at least one item relating to the coordinate information by calculation, which can describe the actual surface shape of the dressing tool.

  In all the embodiments, some of the plurality of steps may be executed simultaneously or overlapping in time. This relates for example to steps c) and d) and possibly to step e).

  Accordingly, the present invention provides a novel method of using a machine polishing tool as a transfer means to transfer a dressing tool region to a polishing tool transfer region. This transfer area is then mapped onto the plunge body and scanned using a coordinate scanning sensor. Because the coordinate relationships within the machine are known, how the topography of the dressing tool appears from the measurements identified on the plunge body, and / or does the dressing tool deviate from preset standards And / or whether the dressing tool deviates from a preset target value.

  Preferably, the computer-implemented coordinate transformation can be used to transform the identified measurements into a description associated with the dress tool.

  The present invention operates particularly accurately because both the dressing tool and the scanning sensor are located at a particular position in the machine. Accordingly, an exact relationship is provided and is preferably utilized within the scope of the present invention.

  In particular in the field of automatic mass production, a worn polishing tool is used to produce a defective polishing tool, and with this polishing tool, the present invention is used in a timely manner before inappropriate gears are produced. This can be prevented.

  By utilizing the present invention, the polishing machine becomes cheaper and the machining can be performed more accurately under certain circumstances.

  The present invention can be employed in a CNC-controlled bevel gear polishing machine and a spur gear polishing machine.

  The present invention enables optimized use of machine performance, improved automation of the dressing process, and high precision with high reproducibility and low defect rate.

  According to the present invention, it is possible to prevent the dress roller from being excessively frequently replaced by extending the dress roller replacement time. By adopting the present invention, the profile reproducibility can be increased and the life of the dressing roller can be extended.

  According to the method of the present invention, a pre-configured (programmed) dressing tool in the machine is used so that the polishing tool can be used for dressing even if the dressing tool is worn to some extent. A dressing operation can be performed. In this way, the dress tool replacement time can be optimized.

  This is a route identification method.

  The present invention can be applied to all polishing tools having diamond coatings, boron nitride coatings (eg, cubic boron nitride, CBN®), silicon carbide coatings, and aluminum oxide coatings.

  In order to achieve a very good regime, the polishing machine is sometimes provided with a diamond dress roller fixedly connected to the machine bed. That is, the diamond dress roller does not require an additional machine axis (except for its own axis of rotation). In such a case, depending on the embodiment, the polishing tool can be moved so as to approach the diamond dress roller while being rotated, and can be mapped onto the plunge body by polishing.

  The static and dynamic stiffness of the plunging body and the axial fixation or fixation have a great influence on the accuracy of this method. Thus, the plunge body is fixedly connected to the machine and preferably fixedly connected to the machine bed in all embodiments.

  Preferably, in all embodiments, when the surface shape is mapped to the plunge body by polishing, the cooling nozzle is secured to the area of the plunge body to optimize the injection of cooling lubricant. .

Further details and advantages of the invention will be described below on the basis of exemplary embodiments with reference to the attached drawings.
It is a schematic side view which shows a part of grinding | polishing disk when machining the tooth | gear flank of an interdental gap. FIG. 5 is a schematic cross-sectional side view showing a part of the polishing cup gear when machining the tooth flank of the inter-tooth gap of the crown gear. FIG. 3 is a schematic cross-sectional side view showing a part of a polishing machine having a polishing cup gear, and the outer peripheral portion of the polishing cup gear is dressed using the polishing disc (the inner peripheral portion of the peripheral portion using the polishing disc). The case of dressing is indicated by a broken line.) It is the schematic of the grinding | polishing disc for grind | pulling a spur gear, a dress disc, and the plunging main-body part which concerns on this invention. FIG. 2 is a very schematic diagram showing a polishing disc and a dressing disc when pressing the transfer area of the polishing disc. It is a very schematic diagram showing a polishing disc when it is transferred to the plunge body. FIG. 5 is a very schematic view showing a state where a transfer area of a polishing disk is pressed against a plunge body. FIG. 2 is a very schematic diagram showing a state of scanning a profile of a plunge body. FIG. 3 is a schematic side view of the polishing machine according to FIG. 2, showing a partial cross section of the polishing cup gear, the polishing machine comprising a plunge body and a coordinate scanning sensor.

  Terms used herein are also used in related publications and patents. However, it should be noted that these terms are only used for a better understanding of the invention. The spirit of the invention and the scope of protection of patent claims are not limited by the interpretation of specially selected terms. The present invention can be readily transferred to other terminology and / or technical fields. Therefore, these terms can be applied to other technical fields.

  Each drawing is schematic and is not to scale.

  The principle of the present invention will be described below on the basis of the greatly simplified schematic diagram of FIG. FIG. 4 shows the essential components of the polishing machine 100 and the basic (relative) movement of these components.

  (Profile) A side view of the polishing disc 10 is shown, which can be driven to rotate about the tool axis R1. The rotating operation of the polishing disk is represented by the symbol ω1. A (form) dress disk 30 is shown in a similar scale. The dress disk 30 can be driven to rotate about the dress axis R3. This rotation operation is represented by the symbol ω3. In order not to make the schematic diagram of FIG. 4 complicated, a state in which the dress disk 30 is moved with respect to the polishing disk 10 in accordance with so-called machining movement is indicated by a block arrow (thick arrow) Z1. The corresponding movement Z1 can be carried out by the dressing disc 30 or the polishing disc 10. This has nothing to do with the machining movement performed when the abrasive disc 10 is guided into the interdental gap of the workpiece 1 (eg the workpiece 1 according to FIG. 1), but rather widely known as the prior art. As described above, the dressing disk is used for periodic dressing of the polishing disk 10 (dressing process). Usually, the machining movement Z1 is a CNC-controlled relative movement in a three-dimensional space.

  In accordance with the present invention, the dressing tool 30 is moved relative to the polishing disc 10 at predetermined intervals, which is represented here as Z2. During this relative movement Z2, at least one contour area of the dressing tool 30 is transferred to the transfer area TB of the polishing tool 10 or a special polishing tool that is chucked (axially fixed) for this operation. . This special polishing tool is a polishing tool used only for measuring the dress tool 30. The term transfer region TB is used to indicate that it is not a region of a polishing tool 10 used to machine a workpiece (eg, workpiece 1 shown in FIG. 1) or of a special polishing tool. Used to indicate area related, this special polishing tool is not used for a workpiece polishing machine. In the polishing disk shown in FIG. 4, the transfer region TB can be formed on one end surface 11 as shown in FIG. The block arrow indicates the relative movement Z2, but is directed obliquely with respect to the transfer region TB of the illustrated embodiment.

  As an essential step of the present invention, the contour area of the dress tool 30 is transferred to the transfer area TB of the polishing tool 10. Preferably, only the contour area of the dressing tool 30 is transferred and used during regular dressing of the abrasive disc 10. Image formation of all other areas of the dress tool 30 is not absolutely necessary.

  Here, as a next step, a relative infeed movement Z3 is performed, which is indicated by another block arrow in FIG. In relation to this relative infeed movement Z3, the transfer area TB of the polishing tool 10 is moved so as to approach the plunge body 40, the plunge body being stationary relative to the movable body in the machine, or It is fixed to the main body. In FIG. 4, the plunge body 40 is illustrated as a rectangle (for example, a rectangular sheet metal member). The static or dynamic stiffness and gripping or fixing of the plunge body 40 has a great influence on the accuracy of the method according to the invention, and the plunge body 40 is preferably fixed to the machine 100 in all embodiments. Preferably fixedly connected to the machine bed. Such a fixed connection (a fixed connection that is detachable if necessary) is denoted by reference numeral 41 in FIG.

  Then, the rotation operation ω1 around the rotation axis R1 of the polishing tool 10 is performed, and the transfer region TB of the polishing tool 10 is plunged to the members constituting the plunge body 40 within the range of the planned relative plunge movement. Pressed). The planned relative plunge movement is performed so that the transfer of the topography of the transfer area TB is performed in the form of a negative (negative) topography, ie the transfer area TB of the polishing tool 10 is “mapped” onto the plunge body 40. Is done. Since the transfer area TB is previously machined using the contour of the dress disk 30, when the topography of the transfer area TB is transferred, a negative “mapping” of the outline of the dress disk 30 is placed on the plunging body 40. To be implemented. In the scope of the present invention, the transfer region TB of the polishing tool 10 is used only as an intermediary (a bridging role) for conveying the form.

  After the instantaneous actual form of the dress disk 30 is transferred to the plunge body 40, the negative topography (also referred to as negative form NF) of the plunge body 40 uses the coordinate scanning sensor by the automatic scanning operation of the machine 100. Detected. The scanning signal detected by the coordinate scanning sensor is transmitted to the computer. This computer may be part of the machine 100 in all embodiments, or it may be a (field) computer that can be connected to the machine 100 using communication technology.

  The actual surface shape of the dress tool 30 can be described by specifying at least one item of coordinate information by calculation using a computer. This coordinate information item may be, for example, the instantaneous maximum value of the dress tool 30.

  With reference to FIGS. 5A to 5D, the above principle will be described more clearly below based on a considerably simplified example.

  FIG. 5A shows that the polishing tool 10 can be rotated after the dress tool 30 is pivoted by 90 degrees compared to FIG. 4 (in special cases, the dress tool 30 remains in its original position. ) Shows that the dress tool 30 is pressed (plunged) in the range of the relative movement Z2 to the transfer region TB of the end surface 11 of the polishing tool 10. In order to simplify and understand, in the illustrated embodiment, the dress tool 30 presses against the transfer region TB in parallel with the direction of the tool axis R1. At least during this pressing (plunge) step, both the dressing tool 30 and the polishing tool 10 rotate (ie, ω1 ≠ 0; ω3 ≠ 0), and a ring-shaped “track” is concentric with the tool axis R1 in the transfer region. Formed. This “track” represents the negative form NF of the contour of the dress tool 30.

  Since scanning the rough surface of the polishing tool 10 is associated with inconvenience as described above, this negative form NF is transferred to the plunge body 40 in the next step. This step is schematically illustrated in FIG. 5B. In this step, a relative infeed (infeed) movement Z3 is performed, and in the range of the relative infeed movement, the transfer region TB of the polishing tool 10 is stationary (fixed to the machine 100). Or move in the direction of the plunge body 40 which is movable in the machine. In FIG. 5B, the plunge body 40 is illustrated as a rectangle (eg, a rectangular sheet metal member).

  FIG. 5C shows a state in which the transfer region TB of the polishing tool 10 is transferred to the constituent members of the plunge main body 40 by performing the planned relative pressing movement. While the plunge movement Z4 is being executed, the topography of the transfer area TB is transferred to the plunge body 40. The form transferred to the plunge body 40 in relation to the topography or contour of the dress tool 30 is a positive topography (also referred to as a positive form PF).

  As schematically shown in FIG. 5D, in order to be able to detect this positive form PF in a metrological manner, an automatic scanning operation of the topography PF of the plunge body 40 is performed using the coordinate scanning sensor 151. In the case of a stationary fixed plunge body, it is necessary to scan so that the feeler does not collide. When the plunge body is fixed to the movable body, the body can move to an optimal position. This scanning can be performed in a contact or non-contact manner. Various methods and means suitable for this purpose are known and can be used without problems by those skilled in the art. In order to scan the positive form PF by the coordinate system K of FIG. 5D, the coordinate scanning sensor 151 can be guided in correspondence with the positive form PF. During scanning, a scanning signal s1 is output. This scanning signal s1 is transmitted from the coordinate scanning sensor 151 to the computer 150 as indicated by a broken line in FIG. 5D.

  Based on the scanning signal s1, the computer 150 determines (calculates), for example, the overall positive form PF or, if necessary, one or more details of the positive form PF. In one or more coordinate transformations, the computer 150 determines at least one item of coordinate information that can be described with respect to the actual surface shape of the dressing tool 30 either directly from the scanning signal s1 or through intermediate steps. Can be determined. For the time being, assuming that all transfer steps are performed without loss and no inaccuracies occur, the positive configuration PF relative to the plunge body 40 is the instantaneous or actual surface shape of the dressing tool 30. One-to-one. This simplified assumption only applies if the dressing tool 30 is simple and pressed against the transfer area using a linear plunging movement parallel to the axis R1. If further operations are performed during the plunge movement step (eg, when the dress tool 30 is pivoted relative to the polishing tool 10), the actual form or actual surface shape of the dress tool 30 is identified / It is necessary to consider relative movement when calculating. Since these relative movements are related to the planned relative plunge movements, in all cases it is necessary to consider the relative movements. That is, the computer 150 needs to know these plunge movements Z4 or can form an image in the coordinate system K.

  The transfer step performed by the present invention is not always accurate in practice, so it should be understood that tolerances are included when identifying / calculating actual aspects or actual surface shapes. is there.

  For example, when the maximum diameter of the dress tool 30 decreases with time (the diameter gradually decreases due to wear), the positive form PF shown in FIG. 5D also gradually decreases. When the thickness (in the direction parallel to the axis R3) of the dress tool 30 decreases with time (thickness gradually decreases due to wear), the positive form PF shown in FIG. 5D also gradually decreases.

  Preferably, for the purpose of accurately adapting to relative machine movement (dress movement) during dressing of the abrasive disc 10 using the dress tool 30, according to the present invention, at least one of the coordinate information described above is used. Use matters. For example, when the maximum diameter of the dressing tool 30 is reduced, the relative infeed (feeding) shown in FIG. 5A is performed so that the dressing tool 30 can be moved while being in contact with the polishing disk 10 regardless of the situation. It is necessary to increase the movement Z2. The computer 150 can already derive various items of coordinate information from this fact. For example, when a new dress disk 30 is used (that is, the dress disk 30 has a target form), if the polishing disk 10 and the transfer region TB come into contact at the coordinate z2 = 0, the dress disk 30 worn at a later point in time. During the plunge process, the contact can be determined at the point of contact at the coordinate position z2. For example, when the coordinate z2 at the time of contact is 1 mm (z2 = 1 mm), the radius of the dress disk 30 is reduced by 1 mm.

  The topography or other changes in the contour of the dressing tool 30 typically result in the addition of circumferential reduction (because of further reduction in the circumferential direction). In the preferred embodiment, the CNC control action sequence is the actual topography that changes. Is applied in two or three dimensions.

  According to one embodiment of the present invention, at least one limit value can be preset when the dress tool 30 is to be replaced.

  Additionally or alternatively, the sensor signal is analyzed by observing the surface of the positive form PF on the plunge body 40 using, for example, a coordinate scanning sensor 151 or using another scanning tool or scanning sensor. Thus, the surface change of the dress tool 30 can be recognized in a timely manner. In addition to the coordinate scanning sensor 151 provided in the machine 100, such another scanning tool or scanning sensor may be provided.

  FIG. 6 is a schematic side view of the polishing machine 100 of FIG. 2, in which a partial cross section of the polishing cup gear 10 is illustrated. The polishing machine 100 includes a plunge body 40 and a coordinate scanning sensor 151. Yes.

  In the specific embodiment shown in FIG. 6, a polishing disk is used as the polishing tool 10, and the polishing disk has a transfer area TB in the rear area 12 (here facing the direction of the tool spindle 101). The transfer region TB extends in a ring shape slightly along the frustoconical surface.

  In all embodiments, the plunge body 40 is connected directly to the machine bed 102 or to a body that is movable within the machine 100. Preferably, in all the embodiments, the plunging body 40 can be stably fixed at a fixed position by using the stable mounting portion 42. In the illustrated embodiment, the foremost region 43 of the plunge body 40 is arranged so that the required contact between the transfer region TB and the foremost region 43 of the polishing tool 10 can be obtained without causing problems due to the CNC control operation. Is done. In the illustrated embodiment, the tool spindle 101 including the polishing tool 10 needs to make a linear movement in the opposite direction to the z2 direction and possibly parallel to the R1 axis to make contact.

  As shown in FIG. 6, as part of the coordinate measurement system 160, the coordinate scanning sensor 151 is preferably connected to the machine bed 102 of the machine 100 in all embodiments. The coordinate measurement system 160 comprises a measurement tower 161, which has a movable boom 162 that is guided accurately, for example. The boom 162 may have a carriage system having a parallelogram structure as described, for example, in European Patent No. 1589317B1 by Klingelnberg GmbH. The coordinate system K described in the measurement tower 161 indicates the three-dimensional measurement system 160 used in all the embodiments according to the present invention.

  In order to allow the relative topography of the dress tool 30 to contact the transfer region TB, it is necessary to perform the corresponding relative movement as described above. Corresponding axes are shown here. The relative movement is preferably controlled / adjusted by the CNC controller 50 in all embodiments according to the invention.

  FIG. 6 illustrates that the CNC controller 50 can perform the functions of the computer 150 and vice versa. However, the CNC controller 50 and the computer 150 can be implemented independently.

  The present invention is preferably used in the CNC control machine 100 in all embodiments, and the CNC control machine has a CNC controller 50 and a tool spindle 101 for fixing the polishing tool 10 to be rotationally driven. The machine 100 further comprises a device 32 having a dressing spindle 31 containing a dressing tool 30. The machine 100 has a coordinate measurement system 160 that carries a scanning sensor 151. The machine 100 is distinguished in that it additionally has a plunge body 40 connected thereto. When the polishing tool 10 rotates about the tool axis R1 of the tool spindle 101, the plunge body can be moved so that the transfer region TB of the polishing tool 10 contacts the plunge body 40. 40 is arranged inside the machine 100. Further, when the polishing tool 10 is rotated about the tool axis R1 of the tool spindle 101 and / or when the dress tool 30 is rotated about the dress axis R3 of the dress spindle 31, the dress tool 30 is polished. The dress tool 30 can be moved so as to come into contact with the transfer region TB of the tool 10.

  Preferably, all embodiments of the machine 100 have a software module SM (see FIG. 6) that analyzes the signals of the coordinate measurement system 160 and determines at least one item of coordinate information. The actual surface shape of the dress tool 30 can be described.

  The software module SM is preferably implemented in all embodiments with at least one computer coordinate transformation to determine matters of coordinate information.

  Suitably, all embodiments according to the invention have a realignment or compensation for wear of the dressing tool 30. The CNC controller 50 and / or the computer 150 can act on the CNC control operation sequence of the machine 100 for this purpose.

  The software module SM is preferably used in all embodiments if the description of the actual surface shape of the dress tool 30 indicates that the dress tool 30 deviates from the tolerance value and / or other evaluation criteria It is designed to output a message or signal if it matches.

  The software module SM is preferably designed in all embodiments so that a message or signal causes the dress tool 30 to be exchanged.

DESCRIPTION OF SYMBOLS 1 ... Workpiece, 10 ... Polishing disk, 11 ... End part surface of polishing tool, 30 ... Dressing disk, 31 ... Dressing spindle, 32 ... Device, 40 ... Plunge body, 42 ... Stable mounting part, 43 ... Forefront area, 50 DESCRIPTION OF SYMBOLS ... CNC controller, 100 ... Polishing machine, 101 ... Tool spindle, 102 ... Machine bed, 150 ... Computer, 151 ... Coordinate scanning sensor, 160 ... Three-dimensional coordinate measuring system, 161 ... Measuring tower, 162 ... Movable boom, R1 ... Tool axis, R3... Dress axis, .omega.1... Polishing disk rotation operation, .omega.3... Dressing disk rotation operation, TB... Polishing tool transfer area, NF .. Negative form, PF.

Claims (11)

A method for identifying a topographic deviation of a dressing tool (30) mounted so as to be rotationally driven around a dressing axis (R3) in a CNC control machine (100),
The CNC control machine has a dressable polishing tool (10) fixed on the tool rotation axis (R1),
The dressing tool (30) has a target surface shape,
The dressing tool (30) has an actual surface shape that deviates from the target surface shape after dressing the polishing tool (10) in the CNC control machine (100),
This method
a) performing a preset relative movement of the dressing tool (30) relative to the polishing tool (10) and at least one contour region of the dressing tool (30) when performing this relative movement; Is transferred to the transfer area of the polishing tool (10), where the transfer area is not the area of the polishing tool (10) used to machine the workpiece.
b) providing a plunge body (40) comprised of a material that can be polished in a CNC control machine (100);
c) performing a relative feed movement (Z3) to move the transfer area of the polishing tool (10) closer to the plunge body (40);
d) performing a rotational motion (ω1) of the polishing tool (10) about the rotational axis (R1) of the polishing tool;
e) performing a preset relative plunge movement (Z4) that presses the transfer area of the polishing tool (10) against the constituent material of the plunge body (40); and performing a relative plunge movement (Z4). The transfer of the topography of the transfer area to the mapping area of the plunge body (40) is performed in the form of a negative topography,
f) performing a topographic automatic scanning operation in the mapping region of the plunge body (40) using the coordinate scanning sensor;
g) sending a scanning signal from the coordinate scanning sensor to the computer;
h) using a computer to determine at least one item relating to coordinate information by calculation, the item being able to describe the actual surface shape of the dressing tool (30).   The method according to claim 1, wherein some of the plurality of steps are executed simultaneously or overlapping with time.   When performing a preset relative movement of the dressing tool (30) relative to the polishing tool (10), the dressing tool (30) is rotated about the dressing axis (R3) and the polishing tool (10) is rotated about the axis of rotation. While rotating around (R1), the dress tool (30) is brought into contact with the polishing tool (10) to transfer a part of the topography of the dress tool (30) to the transfer region of the polishing tool (10). 3. A method according to claim 1 or 2, characterized in that   4. A method according to any one of the preceding claims, characterized in that after transferring the topography, a relative backward movement is carried out in order to remove the transfer area from the material constituting the plunge body (40).   5. A method according to claim 1, wherein the coordinate scanning sensor is an integral part of the CNC control machine (100).   The actual surface shape of the dressing tool (30) processed in the CNC control machine (100) indirectly using the plunge body (40) without having to move or re-axis the dressing tool (30). The method according to claim 1, wherein the method can be determined.   Even if the dressing tool (30) is worn to some extent, the dressing movement of the dressing tool (30) is controlled by a CNC control machine (so that the dressing tool (30) can be used to dress the polishing tool (10). 100). The method according to any one of claims 1 to 6, characterized in that it can be carried out within 100). A CNC controller (50), a tool spindle (101) for fixing the polishing tool (10) to be rotationally driven, a device (32) having a dress spindle (31) including a dress tool (30), and a scanning sensor (151). A CNC control machine (100) equipped with a coordinate measuring system comprising:
The CNC control machine (100) further comprises a plunge body (40) connected to the CNC control machine or a body movable within the CNC control machine,
When the polishing tool (10) rotates about the tool axis (R1) of the tool spindle (101), the transfer area (TB) of the polishing tool (10) can contact the plunge body (40), The plunge body (40) is arranged inside the CNC control machine (100),
When the polishing tool (10) rotates about the tool axis (R1) and / or the dressing tool (30) rotates about the dressing axis (R3) of the dressing spindle (31), the dressing tool ( 30) can be brought into contact with the transfer area (TB) of the polishing tool (10),
Here, the CNC control machine (100) has a software module (SM),
The software module (SM) is designed for the purpose of analyzing the signal (s1) of the coordinate measurement system (160) and determining at least one item of coordinate information and describing the actual surface shape of the dressing tool (30). The
Here, the transfer region (TB) is not a region of the polishing tool (10) used for polishing the workpiece.
A CNC control machine characterized by that. The CNC control machine according to claim 8, characterized in that the software module (SM) performs coordinate transformation by at least one calculation in order to determine matters of coordinate information. The software module (SM) may provide a description of the actual surface shape of the dress tool (30) indicating that the dress tool (30) is out of tolerance and / or other criteria are met. , CNC-controlled machine according to claim 9, characterized by outputting a message or signal. Message or signal CNC-controlled machine of claim 10, characterized in that the message or signal to cause the replacement of the dressing tool (30).

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